دانلود رایگان مقاله انگلیسی بهبودبخشی برنامه اینترنت اشیا میان افزاری از طریق مکانیسم مدیریت کیفیت خدمات قابل تنظیم - الزویر 2018

Abstract

In the recent years, telecom and computer networks have witnessed new concepts and technologies through Network Function Virtualization (NFV) and Software-Defined Networking (SDN). SDN, which allows applications to have a control over the network, and NFV, which allows deploying network functions in virtualized environments, are two paradigms that are increasingly used for the Internet of Things (IoT). This Internet (IoT) brings the promise to interconnect billions of devices in the next few years rises several scientific challenges in particular those of the satisfaction of the quality of service (QoS) required by the IoT applications. In order to address this problem, we have identified two bottlenecks with respect to the QoS: the traversed networks and the intermediate entities that allows the application to interact with the IoT devices. In this paper, we first present an innovative vision of a “network function” with respect to their deployment and runtime environment. Then, we describe our general approach of a solution that consists in the dynamic, autonomous, and seamless deployment of QoS management mechanisms. We also describe the requirements for the implementation of such approach. Finally, we present a redirection mechanism, implemented as a network function, allowing the seamless control of the data path of a given middleware traffic. This mechanism is assessed through a use case related to vehicular transportation

6. Conclusions and future works

QoS-oriented considerations will have to be tackled at different levels of the communication stack for the future middleware IoT applications. In parallel, the advent of virtualization and softwarization technologies open new opportunities to tackle this issue. Deployment of network functions (NF) is now to be really considered. In the same way, network operators will progressively “open” their network, allowing their users to “program” the network depending on their requirements. As a result, the near future Internet will be even more heterogeneous than the current one, both in terms of NF deployment solution and in terms of network programing capabilities. In this context, this paper first detailed this general problematic. It then presented our vision for a dynamic and autonomic management of the QoS required by IoT applications, distributed in such heterogeneous environment. Finally, we exposed a case study illustrating how to tackle a new problem dealing with the implementation of a QoS-oriented NF “outside” of the data path followed by the traffic generated by a middleware-based application. We designed a redirection NF that is dynamically plugged without interrupting the data transfer. We also showed through experimental results the benefits that can be induced by such an adaptation. Our current and future work deal with several points related to the design of the architecture of the targeted autonomous system, and the elaboration of theoretical models to drive the monitoring, the analysis and the planning phases of the MAPE-K loop.